I think my Yahoo Search engine is compromised by a virus or spy/ad ware?

For some days whenever I click on any link listed on a Yahoo search results , instead of reaching directly to the website I am looking for I am redirected to very many different directory websites . This is not happening with Windows Live search. I ran several times the Bit Defender Total Security anti virus but... show more For some days whenever I click on any link listed on a Yahoo search results , instead of reaching directly to the website I am looking for I am redirected to very many different directory websites .
This is not happening with Windows Live search.
I ran several times the Bit Defender Total Security anti virus but no virus was found.
Therefore I think the Yahoo Search engine is compromised by a virus.
I would appreciate your quick answer for this annoying matter.
Thanks
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